var host = "192.168.16.35";
var baseUrl = "http://" + host + ":8080";


function ajax(params) {
	
	var isLoading = params.isLoading;
	
	if(isLoading){
		//显示加载框
		uni.showLoading({
			title: '请求中....'
		});
	}
	
	//准备一个请求头
	var header = {};
	var loginToken = uni.getStorageSync("login_token");
	if(loginToken) {
		header.loginToken = loginToken;
	}
	
	//如果是post请求设置请求头
	if(params.type == "POST"){
		header["content-type"] = "application/x-www-form-urlencoded";
	}
	
	var p = {
		method: params.type ? params.type : "GET",
		url: baseUrl + params.url,
		header: header,
		data: params.data ? params.data : {},
		success: (result) => {
			//获取后端返回的r对象 code msg data
			var r = result.data
			if(r.code == 200) {
				//后端请求成功
				//回调success方法
				if(params.success){
					params.success(r.data);
				}
			} else {
				//请求失败
				
				var result = false;
				//判断是否传递失败的方法
				if(params.fail){
					result = params.fail(r);
				} 
				
				
				if(!result){
					var msg = r.msg;
					//弹出msg
					uni.showToast({
						title: msg,
						icon: "error"
					})
				}
			}
		},
		complete: () => {
			if(isLoading) {
				//关闭弹框
				uni.hideLoading()
			}
		}
		
	};
	
	uni.request(p);
}


function getImg(fileName) {
	return baseUrl + "/file/download?fileName=" + fileName
}


//判断是否登录
function isLogin(){
	//获取令牌
	var loginToken = uni.getStorageSync("login_token");
	//如果存在令牌
	if(loginToken){
		//存在令牌 - 判断是否过期，解析jwt令牌
		var userInfo = parseJwt(loginToken);
		// {uid: 10, nickname: '张三', header: '09dec50f-68b2-4c49-82c7-421657a39e31', exp: 1698313271, iat: 1698306071}
		// console.log("解析jwt令牌：", userInfo);
		//过期时间
		var exp = userInfo.exp;
		//当前时间
		var now = parseInt(new Date().getTime() / 1000);
		
		//判断是否过期
		if(now < exp){
			return true;
		}
		
		//过期了
		uni.removeStorageSync("login_token");
	}
	
	//跳转到登录页
	uni.navigateTo({
		url: "/pages/login/login"
	})
	return false;
}

/**
 * 获取当前登录的用户信息
 */
function getUserInfo(){
	//获取令牌
	var loginToken = uni.getStorageSync("login_token");
	//存在令牌 - 判断是否过期，解析jwt令牌
	var userInfo = parseJwt(loginToken);
	//返回解析后的结果
	return userInfo;
}

//解析jwt令牌
function parseJwt(token) {
	let strings = token.split("."); //截取token，获取载体
	//通过base64解码
	var result = new Base64().decode(strings[1].replace(/-/g, "+").replace(/_/g, "/")).trim();
	var userinfo = JSON.parse(result);
	return userinfo;
}

/** 
 * 
 * 自定义Base64编解码的方法
 * 
 * @author haitao.tu 
 * @date 2010-04-26 
 * @email tuhaitao@foxmail.com 
 * 
 */
function Base64() {

	// private property 
	var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

	// public method for encoding 
	this.encode = function(input) {
		var output = "";
		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		var i = 0;
		input = this._utf8_encode(input);
		while (i < input.length) {
			chr1 = input.charCodeAt(i++);
			chr2 = input.charCodeAt(i++);
			chr3 = input.charCodeAt(i++);
			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;
			if (isNaN(chr2)) {
				enc3 = enc4 = 64;
			} else if (isNaN(chr3)) {
				enc4 = 64;
			}
			output = output +
				_keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
				_keyStr.charAt(enc3) + _keyStr.charAt(enc4);
		}
		return output;
	}

	// public method for decoding 
	this.decode = function(input) {
		var output = "";
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0;
		input = input.replace(/[^A-Za-z0-9+/=]/g, "");
		while (i < input.length) {
			enc1 = _keyStr.indexOf(input.charAt(i++));
			enc2 = _keyStr.indexOf(input.charAt(i++));
			enc3 = _keyStr.indexOf(input.charAt(i++));
			enc4 = _keyStr.indexOf(input.charAt(i++));
			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;
			output = output + String.fromCharCode(chr1);
			if (enc3 != 64) {
				output = output + String.fromCharCode(chr2);
			}
			if (enc4 != 64) {
				output = output + String.fromCharCode(chr3);
			}
		}
		output = this._utf8_decode(output);
		// 替换不可见的特殊字符
		output = output.replace(/[\n\r\t]/g, "");
		output = output.trim();
		output = output.substring(0, output.lastIndexOf("}") + 1);
		return output;
	}

	// private method for UTF-8 encoding 
	this._utf8_encode = function(string) {
		string = string.replace(/rn/g, "n");
		var utftext = "";
		for (var n = 0; n < string.length; n++) {
			var c = string.charCodeAt(n);
			if (c < 128) {
				utftext += String.fromCharCode(c);
			} else if ((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			} else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}

		}
		return utftext;
	}

	// private method for UTF-8 decoding 
	this._utf8_decode = function(utftext) {
		var string = "";
		var i = 0;
		var c = 0;
		var c1 = 0;
		var c2 = 0;
		var c3 = 0;
		while (i < utftext.length) {
			c = utftext.charCodeAt(i);
			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			} else if ((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i + 1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			} else {
				c2 = utftext.charCodeAt(i + 1);
				c3 = utftext.charCodeAt(i + 2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}
		}
		return string;
	}
}


//全局注册方法
export {
	ajax,
	getImg,
	baseUrl,
	isLogin,
	getUserInfo,
	host
}